APA (7th ed.) Citation

Phillips, T. L., Pfefferkorn, H. W., & Peppers, R. A. (1973). Development of paleobotany in the Illinois Basin. Illinois State Geological Survey.

Chicago Style (17th ed.) Citation

Phillips, Tom Lee, Hermann W. Pfefferkorn, and Russel A. Peppers. Development of Paleobotany in the Illinois Basin. Urbana: Illinois State Geological Survey, 1973.

MLA (9th ed.) Citation

Phillips, Tom Lee, et al. Development of Paleobotany in the Illinois Basin. Illinois State Geological Survey, 1973.